WC-85DM A/B Page 1 of 2 Date: 02/24/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
WC-85DM A/B
WATER CLEAR RIGID 85 SHORE D
URETHANE CASTING SYSTEM
WC-85DM A/B is a rigid, 85 shore D, Mercury and Phthalate free, Water Clear aliphatic polyurethane designed to make clear or
tinted castings of all kinds. Its low viscosity with good heat resistance is perfect for a variety of prototype and short run production
parts. Its ability to accept pigments ranging from light to dark colors, and color stability when exposed to moderate UV light, make it
a great system for a variety of real-world applications. This system responds very well to heated tools for quicker demolds and faster
mold turnover.
Exceptional clarity Low Viscosity High Heat Resistance
RoHS/REACH Compliant Color Stability Mercury and Phthalate Free
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240-04e1 85 2
Density (g/cc) ASTM D792-00 1.130
Cubic Inches per Pound N/A 25.9
Color/Appearance Visual Colorless/Clear
Tensile Strength (psi) ASTM D638-03 9,400
Tensile Modulus (psi) ASTM D638-03 3.3 x 10
5
Elongation (%) ASTM D638-03 22
Flexural Strength (psi) ASTM D790-03 14,000
Flexural Modulus (psi) ASTM D790-03 3.5 x 10
5
Shrinkage (in/in) linear 12 x1/2 x1/2 0.003
Izod Impact, notched (ft-lb/in) ASTM D256-05 0.55
Heat Deflection Temperature @ 66 psi ASTM D648-04 175 F (79.4 C)
Heat Deflection Temperature @ 264 psi ASTM D648-04 165 F (74 C)
Dielectric Constant, 1 MHz ASTM D150-87 2.944
Dissipation Factor, 1 MHz ASTM D150-87 0.0112
*Note: Reported physical properties are based on test specimens cured 1-2 hours at room temperature then 16 hours at 160 F (71.1 C).
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 65
Mix Ratio by volume 100 68
Specific Gravity @ 77 F (25 C) 1.09 1.04
Color Colorless Colorless
Viscosity (cps) @ 77 F (25 C) Brookfield 110 2,200
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 325
Work Time, 100g mass @ 77 F (25 C) 14 16 minutes
Gel Time 16 18 minutes
Demold Time @ 77 F (25 C) 6-8 hours
Demold Time @ 120 F (49 C) 3-4 hours
Properties above are typical and not for specifications.
ALIPHATIC & WATER CLEAR URETHANES
Dedicated to QUALITY, SERVICE, SAFETY, and INNOVATION
An ISO-9001 Certified company
WC-85DM A/B Page 2 of 2 Date: 02/24/2021
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
NON-WARRANTY “Except for a warranty that materials substantially comply with the data presented in Manufacturer’s latest bulletin describing the product (the basis for this substantial
compliance is to be determined by the standard quality control tests generally performed by Manufacturer), all materials are sold “AS IS” and without any warranty express or implied as
to merchantability, fitness for a particular purpose, patent, trademark or copyright infringement, or as to any other matter. In no event shall Manufacturer’s liability for damages exceed
Manufacturer’s sale price of the particular quantity with respect to which damages are claimed.”
NOTE:
Platinum Silicone Mold materials are recommended for best results. Newly made Tin (Condensation Cure) Silicone molds may
cause inhibition with this Water Clear material. A bake-out process is recommended to remove reaction byproducts from Tin cure
silicones. Contact BJB s technical department for guidance on this process.
CURE SCHEDULE/HEAT CURING:
WC-85DM A/B is designed to be as user friendly as possible but can be more moisture sensitive compared to other BJB systems.
Avoid paper products and wood stir sticks. If casting at room temperature, vacuum degassing and pressure casting is highly
recommended to eliminate bubbles. When not casting under pressure, pre-heating the molds to above 100 F (38 C) can help eliminate
potential moisture bubbles. WC-85DM responds very well to heat curing. Demold times can be dramatically reduced by adding heat.
Pre-heating the mold and curing at 120 F (49 C) allows thin walled parts to be demolded as quick as 3-4 hours while retaining the
benefit of a 14-16 minute working time for proper mixing and vacuum degassing.
STORAGE AND HANDLING:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 months from date of shipment
when properly stored at recommended temperatures. Purge opened containers with dry nitrogen before re-sealing.
PACKAGING Part A Part B
Cubic Inches
per Kit
Gallon Kits 8 lbs. 5.2 lbs. 342
5-Gallon Kits 40 lbs. 26 lbs. 1,709
55-Gallon Drum Kits 440 lbs. 286 lbs. 18,803
SAFETY PRECAUTIONS:
Avoid contact with skin. Use protective gloves and protective clothing. Repeated or prolonged contact on the skin may cause an
allergic reaction. Eye protection is extremely important. Always use approved safety glasses or goggles when handling this product.
Use in well-ventilated areas. Avoid breathing vapors. If exposures cannot be kept at a minimum, a respirator may be necessary in
addition to ventilation. The use of a positive pressure air supplied respirator is mandatory when airborne isocyanate concentrations
are not known or exceeds OSHA S TWA of 0.005 ppm. Air purifying, organic cartridge type respirators are not generally
recommended to use when handling this material without implementation of an end of life service program. Observe OSHA
regulations for respirator use (29 CFR 1910.134). Employers are responsible for selecting the correct respirator for each situation.
IF CONTACT OCCURS:
Skin: Immediately wash with soap and water. Remove contaminated clothing and launder before reuse. It is not
recommended to remove resin from skin with solvents. Solvents only increase contact and dry skin. Seek qualified
medical attention if allergic reactions occur.
Eyes: Immediately flush with water for at least 15 minutes. Call a physician.
Ingestion: If swallowed, call a physician immediately. Remove stomach contents by gastric suction or induce vomiting only as
directed by medical personnel. Never give anything by mouth to an unconscious person.
Refer to the Material Safety Data Sheet before using this product.
Handling Guide